Littelfuse LFR25030-1P - The new Littelfuse Class H and R blocks offer many advantages over previous generations that are noted in the features and benefits section. Class H and Class R fuse blocks are dimensionally the same, but Class R blocks incorporate a rejection feature, which only allows Class R fuses to be inserted.
Littelfuse

LFR25030-1P

Alternate Item Number: LFR250301P

UPC: 079458181241

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Overview

The Littelfuse Class H and R fuse blocks (SKU: LFR25030-1P) represent a significant advancement in industrial circuit protection, combining dimensional compatibility with critical safety features. Designed for professionals who demand reliability and precision, these fuse blocks ensure optimal performance in high-stakes environments where electrical faults can lead to costly downtime or safety hazards. The Class H and Class R variants share identical dimensions, allowing for seamless integration into existing systems while offering distinct advantages tailored to specific compliance requirements. Class R blocks incorporate a patented rejection feature, a mechanical safeguard that physically prevents the insertion of incorrect fuse types, eliminating the risk of misapplication and ensuring adherence to stringent safety standards such as UL 248 and NEC guidelines. Industrial applications demand components that deliver both performance and peace of mind, and the Littelfuse LFR25030-1P excels in this regard. These fuse blocks are engineered for use in industrial control panels, power distribution systems, motor controllers, and machinery where reliable overcurrent protection is non-negotiable. The rejection feature in Class R blocks is particularly valuable in environments governed by OSHA, NFPA, or other regulatory bodies that mandate specific fuse types for arc fault and overload protection. By enforcing correct fuse installation, the LFR25030-1P reduces human error, minimizes equipment damage, and enhances overall system integrity. Littelfuse’s reputation as a leader in circuit protection solutions is built on decades of innovation and adherence to global standards. The LFR25030-1P fuse blocks are manufactured to meet or exceed UL, CSA, and CE certifications, ensuring compatibility with international electrical codes. Their robust construction—typically featuring high-impact thermoplastic housings and corrosion-resistant terminals—guarantees durability in harsh industrial settings, from manufacturing floors to renewable energy installations. Professionals in industries such as automotive, aerospace, mining, and data centers rely on Littelfuse products to safeguard critical infrastructure, knowing that each component undergoes rigorous testing for thermal stability, dielectric strength, and mechanical endurance. Installation of the LFR25030-1P is straightforward, thanks to its standardized footprint and clear labeling. The blocks are designed for panel mounting, with options for DIN rail or direct surface installation, accommodating diverse system configurations. When paired with Littelfuse’s extensive range of Class H and Class R fuses, the LFR25030-1P provides a complete protection solution that scales from low-voltage control circuits to high-current distribution networks. For engineers and technicians, this means reduced inventory complexity, simplified maintenance, and the confidence that comes from using a trusted brand with a global service network. Choosing the right fuse block is about more than just electrical ratings—it’s about risk mitigation, regulatory compliance, and long-term system reliability. The Littelfuse LFR25030-1P delivers on all fronts, offering a cost-effective way to upgrade legacy systems or design new installations with future-proof protection. Whether you’re retrofitting an aging panel or specifying components for a greenfield project, the Class H/R fuse blocks from Littelfuse provide the performance, safety, and versatility required to keep operations running smoothly. Trusted by OEMs and end-users alike, Littelfuse products are a cornerstone of modern industrial electrical design.
  • Dual Class H and Class R compatibility with identical dimensions for flexible system design
  • Class R blocks feature rejection mechanism to prevent incorrect fuse insertion
  • UL 248 and NEC compliant for enhanced safety in industrial applications
  • High-impact thermoplastic housing with corrosion-resistant terminals for durability
  • Ideal for industrial control panels, power distribution, and machinery protection

Specifications

Brand Name
Littelfuse
Special Features
Universal mounting holes
Standard
UL Listed and CSA Certified RoHS
Sub Brand
LFR Series
Type
Fuse Block
Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount

GPM-SRR90

Fuse Block 600VAC 600VDC Class CC 30A 1/4in Quick Connect / Solder 90 angle screw Knob Panel Mount
BB18 is a three-phase busbar terminal power feed lug, which is intended for use with LPSM/LPSC series fuse holders. See datasheet for more detailed specifications.

BB18

BB18 is a three-phase busbar terminal power feed lug, which is intended for use with LPSM/LPSC series fuse holders. See datasheet for more detailed specifications.
D4/8.SFT2.I.ADO

1SNA399777R1200

D4/8.SFT2.I.ADO
2000W 5V 150A 24V 10A 2-12V 1P

SH20-P3T53J4

2000W 5V 150A 24V 10A 2-12V 1P

Frequently Asked Questions about Littelfuse

What certifications and standards do Littelfuse products comply with?

Littelfuse products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Customers can verify specific product certifications by consulting individual product datasheets on Littelfuse.com, which provide comprehensive details about standards compliance for each component.

What industries and applications are Littelfuse products used for?

Littelfuse products are critical for electrical protection and safety across multiple industrial sectors, including manufacturing, automation, power distribution, and electrical control systems. Their comprehensive product portfolio serves industries that require robust electrical protection, including motor and pump applications, solar installations, programmable logic controllers (PLCs), electrical switch panels, and critical infrastructure environments. Key product lines protect against overcurrent, voltage transients, ground faults, and temperature-related electrical risks, ensuring equipment safety and operational reliability.

What technical support does Littelfuse offer?

Littelfuse offers comprehensive technical support through multiple channels. Their Technical Hotline (800-TEC-FUSE) provides direct access to engineers who can help identify issues and recommend solutions. Additionally, Littelfuse offers extensive online Technical Resources at Littelfuse.com, including datasheets, product manuals, whitepapers, application guides, and online design tools. Their experienced product and application engineers also provide step-by-step support from design to installation.

What are the main product lines offered by Littelfuse?

Littelfuse offers comprehensive industrial protection and control product lines, including fuses, fuse holders, protection relays, temperature sensors, and electrical safety components. Their key product categories span surge protective devices, custom OEM products, electrical switch panels, medium voltage fuses, ground-fault protection relays, motor and pump protection devices, and temperature sensors. These products are designed to minimize electrical safety hazards, limit equipment damage, improve productivity, and safeguard personnel from electrical faults.

What are the key features of Littelfuse products?

Littelfuse products feature exceptional circuit protection technologies with key characteristics including UL/IEC safety standard compliance, low internal resistance, and advanced protective capabilities across multiple product lines. Their components provide critical protection for industrial systems, offering features like overcurrent protection, voltage transient suppression, and resettable protection devices with ultra-low resistance and compact designs. Key product lines include fuses, metal oxide varistors (MOVs), TVS diodes, PolySwitch devices, and specialized electronic protection components that enhance system reliability and safety.

What environmental ratings do Littelfuse products have?

Littelfuse products feature comprehensive environmental ratings, including NEMA Type 1, 2, 3, 3R, 4/4X, 12, and 13 certifications, as well as IP65 protection. These ratings ensure superior protection in diverse industrial environments, with an operating temperature range of -40°F to +131°F (-40°C to +55°C). Many products also include UV-stabilized materials and neoprene gaskets for enhanced durability in outdoor and challenging conditions.

What accessories are available for Littelfuse products?

Littelfuse offers several key accessories across their product lines, including fuse holders, voltage monitoring modules, and terminal connectors. Specific accessories include the LPSM003ZXID (indicating) and LPSM003Z (non-indicating) POWR-SAFE Dead Front fuse holders for Class CC and Midget-Style fuses, the VRM6048 voltage monitor accessory module, and female quick connect terminals (P1015 series) in various wire gauge sizes. These accessories are designed to enhance protection, monitoring, and connectivity for Littelfuse electrical components.

What is Littelfuse's warranty policy?

Littelfuse provides comprehensive warranty details on their official website at www.littelfuse.com/warranty. Customers should visit this page to review the specific warranty terms and conditions for their specific product lines. For direct warranty support or questions, customers can contact Littelfuse Technical Support at 1-800-TEC-FUSE or email [email protected].

What communication protocols do Littelfuse products support?

Littelfuse supports a comprehensive range of industrial communication protocols, including PROFIBUS, PROFINET, EtherNet/IP, DeviceNet, Modbus RTU, and CANopen. Our products provide flexible connectivity solutions across multiple industrial automation platforms, enabling seamless integration with various control systems and network architectures.

How are Littelfuse products typically installed?

Littelfuse products are typically installed using specialized mounting hardware like fuse holders, blocks, and panels designed for specific industrial applications. The POWR-SAFE Dead Front holders, for example, provide optimum protection for Class CC and Midget-Style fuses, supporting installations up to 600 VAC/DC. Installation often involves using precision terminals with strain relief, such as 0.25 in. female quick connect terminals, to ensure secure and safe electrical connections in industrial control systems.